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My LoL client has unstable FPS (40-80)

Hello, I've recently reformatted to W7, and started to experience unstable FPS in LoL after it. Whenever I start the game it would be running anywhere from 60-80 FPS (its noticeable and effecting my game play), and if I where to run a resource heavy program in the background it would drop to 40 but still sporadically spike to 80 as well every 2-3 seconds.

It feels like my game can't decide whether or not it wants to work properly, on top of that whenever I turn on Vertical Sync I would have to reinstall the game after one match. If I don't the match after that one doesn't load at all, giving my monitor a screen saying "NOT SUPPORT!", on 2 occasions I've gotten a leave because of this(unranked thankfully).

I've tried the slider (Stable, Benchmark, High), no matter the setting it still reacts unstable (If I put 60 FPS as the limit it will still go beyond that into 80, and if nothing else is on in the background even 120). I have all my drivers upgraded, I'm running a Radeon 5750 with a AMD Phenom II Black Edition (both stock clock) and 4 gigs of borderline DDR2 ram.

Well even though the game states I have high FPS, since it's going from 1 extreme scale to another and back its causing these noticeable hiccups in the game that hurt me a lot. I haven't really been able to play for a week to my full extent because of it.